What is mcdbus?

The genuine mcdbus.sys file is a software component of MagicISO SCSI Host Controller Driver by MagicISO Inc..
"Mcdbus.sys" is the driver file for MagicISO Inc.'s "MagicDisc" freeware that creates and manages virtual CD drives. A data image of an optical disc's content in ISO_9660 format (or any of 16 others) can be digitally "played" without the physical medium being in a drive. This includes executing games and applications as well as reading data or playing music or video. It installs in "C:\Windows\System32". Being an unsigned driver, it will not install in Windows 8 unless is set to "off." Uninstalling MagicDisc under Windows 7 can cause a system crash unless this driver file is first manually deleted in "safe" mode followed by a reboot. MagicISO Inc. was founded in Shanghai, China in 2001. It is associated with Yasasoft and Xilisoft and a developer named Martin Colman. These companies specialize in programs for conversion between many different data formats.

MCDBus stands for Magic CD Bus

Mcdbus.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if mcdbus.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for mcdbus drivers in need of updating

Mcdbus.sys file information

The process known as MagicISO SCSI Host Controller belongs to software Driver for MagicISO SCSI Host Controller or MagicDisc or JiaPing Gan by MagicISO (

Description: Mcdbus.sys is not essential for Windows and will often cause problems. The mcdbus.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 116,736 bytes (71% of all occurrences), 255,552 bytes or 92,160 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. The file is not a Windows system file. Therefore the technical security rating is 31% dangerous; but you should also compare this rating with the user reviews.

Uninstalling this variant: In case of any problems with mcdbus.sys, you can remove the entire program MagicDisc using Windows Control Panel.

Recommended: Identify mcdbus.sys related errors

Important: Some malware camouflages itself as mcdbus.sys. Therefore, you should check the mcdbus.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

it gave me a blue screen of death
  mark mitchell  
driver for MagicDisc/MagicIso. can cause BSOD, remove program if suspected
I have MagicDisc, but disabled from services.msc from startup no problems, it's legit
Driver for MagicISO's MagicDisc freeware. Used to create a virtual drive for mounting disk image files such as ISO, BIN, IMG, VC4 etc. Pretty harmless and definitely not essential. If you experience problems with it, just remove.
  Alex B.   (further information)
I have used this small, extremely lite cd virtual driver software for over 4 years now. beginning with winxp, and continued on win7 ult x64. I loved how magic iso allowed the small magicdisc utility. however sometime within the last month it started causing Blue Screens of Death.
  BSoD   (further information)
DO NOT install Magic Disk in win 7 pro 64bit. You will not be able to uninstall it correctly and it may make your system inaccessible - you have been warned. Works fine in windows XP though.

Rating chart

Summary: Average user rating of mcdbus.sys: based on 6 votes with 6 user comments. 2 users think it's probably harmless. 2 users think it's neither essential nor dangerous. 2 users suspect danger.

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Best practices for resolving mcdbus issues

A clean and tidy computer is the key requirement for avoiding problems with mcdbus. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the mcdbus.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

mcdbus.sys [all]